Managing Databases with Oracle
An Oracle System Change Number (SCN):

is a value that is incremented whenever a dirty read occurs.
is a value that keeps track of explicit locks.
is incremented whenever a deadlock occurs.
is a value that is incremented whenever database changes are made.

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Managing Databases with Oracle
Which statement about sequences is not true?

A sequence is an object that generates a sequential series of unique numbers.
Sequences are most often used to provide values for surrogate keys.
NextVal and CurrVal are both sequence methods.
Sequences guarantee valid surrogate key values.

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Managing Databases with Oracle
Which of the following is not true about modifying table columns?

You can add a column at any time as long as it is a NULL column.
You can drop a column at any time.
You cannot increase or decrease the number of decimal places.
You can increase the number of characters in character columns or the number of digits in numeric columns

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